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Borrowings - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Short-term borrowings    
Short-term borrowings $ 14,840 $ 15,900
Net loans 3,950,485 3,951,729
Total investment securities 582,233 606,943
FHLB Advances    
Short-term borrowings    
Short-term borrowings 2,300,000  
Discount Window    
Short-term borrowings    
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 135,400  
Assets pledged as collateral | Borrow in Custody Program    
Short-term borrowings    
Net loans 585,600  
Assets pledged as collateral | Discount Window    
Short-term borrowings    
Total investment securities 142,800  
Federal Reserve Bank Discount Window    
Short-term borrowings    
Maximum borrowing capacity 583,200  
Bank Term Funding Program    
Short-term borrowings    
Short-term borrowings 14,800 15,900
Borrow in Custody Program    
Short-term borrowings    
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 447,800  
Bank    
Short-term borrowings    
Maximum borrowing capacity 1,600,000 1,700,000
Outstanding amount in borrowings 88,800 99,100
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits $ 417,400 $ 487,800